v1.9.2
Compatible with 1.4.6 and earlier 1.4 builds (1.4.2, 1.4.5...)
Add additional compatibility check. If TagAPI works for you currently you do not need to upgrade.

v1.9.1
Compatible with 1.4.6, 1.4.5, and other 1.4 builds.

v1.9
Fixes an issue in 1.8, apparently!
Compatible with 1.4, including builds after December 5.
Required for R0.3 when it's out.

v1.8
Compatible with 1.4, including builds after December 5.
Required for R0.3 when it's out.

v1.7.1
Fixed little bug in startup. This version will not dump a stacktrace if you use an incompatible version of craftbukkit.

v1.7
Added support for ProtocolLib (optional)
If you happen to have ProtocolLib it'll now work fine with TagAPI. No changes required either way.
Changed method handling so that badly written plugins will throw an error blaming the correct plugin